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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: NullableField.html 743 2015-01-28 21:39:47Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.gui;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.vaadin.data.Property;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.vaadin.ui.Alignment;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import com.vaadin.ui.Button;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import com.vaadin.ui.Field;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.dellroad.stuff.vaadin7.FieldLayout;<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>/**<a name="line.17"></a>
<span class="sourceLineNo">018</span> * Wraps a {@link Field} that is capable of displaying, but not necessarily choosing, a null value,<a name="line.18"></a>
<span class="sourceLineNo">019</span> * and adds a "Null" button that sets the value to null.<a name="line.19"></a>
<span class="sourceLineNo">020</span> */<a name="line.20"></a>
<span class="sourceLineNo">021</span>@SuppressWarnings("serial")<a name="line.21"></a>
<span class="sourceLineNo">022</span>public class NullableField&lt;T&gt; extends FieldLayout&lt;T&gt; {<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>    private final SmallButton nullButton = new SmallButton("Null", new Button.ClickListener() {<a name="line.24"></a>
<span class="sourceLineNo">025</span>        @Override<a name="line.25"></a>
<span class="sourceLineNo">026</span>        public void buttonClick(Button.ClickEvent event) {<a name="line.26"></a>
<span class="sourceLineNo">027</span>            NullableField.this.field.setValue(null);<a name="line.27"></a>
<span class="sourceLineNo">028</span>        }<a name="line.28"></a>
<span class="sourceLineNo">029</span>    });<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>    public NullableField(Field&lt;T&gt; field) {<a name="line.31"></a>
<span class="sourceLineNo">032</span>        super(field);<a name="line.32"></a>
<span class="sourceLineNo">033</span>        this.setMargin(false);<a name="line.33"></a>
<span class="sourceLineNo">034</span>        this.setSpacing(true);<a name="line.34"></a>
<span class="sourceLineNo">035</span>        this.addComponent(this.field);<a name="line.35"></a>
<span class="sourceLineNo">036</span>        this.addComponent(this.nullButton);<a name="line.36"></a>
<span class="sourceLineNo">037</span>        this.setComponentAlignment(this.nullButton, Alignment.MIDDLE_LEFT);<a name="line.37"></a>
<span class="sourceLineNo">038</span>        this.field.addValueChangeListener(new Property.ValueChangeListener() {<a name="line.38"></a>
<span class="sourceLineNo">039</span>            @Override<a name="line.39"></a>
<span class="sourceLineNo">040</span>            public void valueChange(Property.ValueChangeEvent event) {<a name="line.40"></a>
<span class="sourceLineNo">041</span>                NullableField.this.updateDisplay();<a name="line.41"></a>
<span class="sourceLineNo">042</span>            }<a name="line.42"></a>
<span class="sourceLineNo">043</span>        });<a name="line.43"></a>
<span class="sourceLineNo">044</span>        if (this.field instanceof Property.ReadOnlyStatusChangeNotifier) {<a name="line.44"></a>
<span class="sourceLineNo">045</span>            final Property.ReadOnlyStatusChangeNotifier notifier = (Property.ReadOnlyStatusChangeNotifier)field;<a name="line.45"></a>
<span class="sourceLineNo">046</span>            notifier.addReadOnlyStatusChangeListener(new Property.ReadOnlyStatusChangeListener() {<a name="line.46"></a>
<span class="sourceLineNo">047</span>                @Override<a name="line.47"></a>
<span class="sourceLineNo">048</span>                public void readOnlyStatusChange(Property.ReadOnlyStatusChangeEvent event) {<a name="line.48"></a>
<span class="sourceLineNo">049</span>                    NullableField.this.updateDisplay();<a name="line.49"></a>
<span class="sourceLineNo">050</span>                }<a name="line.50"></a>
<span class="sourceLineNo">051</span>            });<a name="line.51"></a>
<span class="sourceLineNo">052</span>        }<a name="line.52"></a>
<span class="sourceLineNo">053</span>    }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>    @Override<a name="line.55"></a>
<span class="sourceLineNo">056</span>    public void attach() {<a name="line.56"></a>
<span class="sourceLineNo">057</span>        super.attach();<a name="line.57"></a>
<span class="sourceLineNo">058</span>        this.updateDisplay();<a name="line.58"></a>
<span class="sourceLineNo">059</span>    }<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>// Internal methods<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>    private void updateDisplay() {<a name="line.63"></a>
<span class="sourceLineNo">064</span>        this.nullButton.setEnabled(this.field.getValue() != null &amp;&amp; !this.field.isReadOnly());<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span>}<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>




























































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